Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 126, NWS Jacksonville, FL

June 19, 2020Nassau County, Florida; Camden County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 19, 2020, 4:00 PM EDT for Nassau County, Florida; Camden County, Georgia. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 19, 2020, 4:00 PM EDT (20:00 UTC)
Expired
Jun 19, 2020, 4:45 PM EDT
In force
45 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Nassau County, FL, Camden County, GA

The radar

The Jacksonville radar (KJAX), 31 km from the middle of the area, began a volume at 20:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.0 hours before the alert went out and 30 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2020-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1679 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2020-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1679 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
753 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 19, 1:27 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jun 19, 1:27 PM EDT, 2 hours 33 minutes before
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In the hours before

Special weather statement, Jun 19, 3:00 PM EDT, 1 hour before
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Special weather statement, Jun 19, 3:42 PM EDT, 18 minutes before
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Local storm report, Jun 19, 3:44 PM EDT, 16 minutes before
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Special weather statement, Jun 19, 3:48 PM EDT, 12 minutes before
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Special weather statement, Jun 19, 3:51 PM EDT, 9 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
Issued by National Weather Service New Orleans LA
351 PM EDT Fri Jun 19 2020

FLZ124-GAZ165-166-192045-
Coastal Nassau FL-Inland Camden GA-Coastal Camden GA-
351 PM EDT Fri Jun 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL NASSAU AND SOUTHERN
CAMDEN COUNTIES UNTIL 445 PM EDT...

* At 351 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Woodbine, moving southeast at
  10 mph.

* Penny size hail, winds in excess of 45 mph, and minor flooding due
  to heavy rainfall is possible with this storm.

* Locations impacted include...
  St. Marys, Kingsland, Woodbine, Kings Bay Base, Harrietts Bluff and
  Colesburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3069 8164 3072 8167 3073 8166 3075 8167
      3075 8168 3074 8167 3075 8170 3090 8187
      3105 8174 3090 8144
TIME...MOT...LOC 1951Z 308DEG 7KT 3093 8174

KLG

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 8:09 PM EDTSevere Thunderstorm WarningJAXMarion37 min
Jun 18, 8:34 PM EDTSevere Thunderstorm WarningJAXPutnam41 min
Jun 18, 8:57 PM EDTSevere Thunderstorm WarningJAXPutnam19 min
Jun 19, 3:00 PM EDTSpecial Weather StatementJAXSaint Johns60 min
Jun 19, 3:42 PM EDTSpecial Weather StatementJAXSaint Johns48 min
Jun 19, 4:12 PM EDTSpecial Weather StatementJAXPutnam48 min
Jun 19, 4:17 PM EDTSpecial Marine WarningJAX104 min
Jun 19, 4:19 PM EDTSpecial Weather StatementJAXClay41 min
Jun 19, 4:38 PM EDTSpecial Weather StatementJAXDuval52 min
Jun 19, 4:42 PM EDTSevere Thunderstorm WarningJAXNassau48 min
Jun 19, 4:44 PM EDTSpecial Weather StatementJAXFlagler46 min
Jun 19, 4:47 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau43 min
Jun 19, 4:50 PM EDTSpecial Weather StatementJAXSaint Johns55 min
Jun 19, 4:53 PM EDTSpecial Weather StatementJAXMarion67 min
Jun 19, 4:57 PM EDTSpecial Marine WarningJAX63 min
Jun 19, 5:06 PM EDTSevere Thunderstorm WarningJAXMarion54 min
Jun 19, 5:16 PM EDTSpecial Weather StatementJAXFlagler59 min
Jun 19, 5:24 PM EDTFlash Flood WarningJAXMarion43 min
Jun 19, 5:31 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau17 min
Jun 19, 5:32 PM EDTSevere Thunderstorm WarningJAXClay, Duval, Saint Johns19 min
Jun 19, 5:37 PM EDTSevere Thunderstorm WarningJAXMarion, Putnam53 min
Jun 19, 5:50 PM EDTSpecial Weather StatementJAXMarion40 min
Jun 19, 6:08 PM EDTSpecial Weather StatementJAXSaint Johns52 min
Jun 19, 6:10 PM EDTSpecial Weather StatementJAXNassau50 min
Jun 19, 6:29 PM EDTSpecial Weather StatementJAXPutnam46 min
Jun 19, 6:53 PM EDTSpecial Weather StatementJAXAlachua52 min
Jun 19, 6:59 PM EDTSpecial Weather StatementJAXAlachua46 min
Jun 19, 7:03 PM EDTSpecial Weather StatementJAXPutnam27 min
Jun 19, 7:09 PM EDTSpecial Weather StatementJAXAlachua51 min
Jun 19, 7:44 PM EDTSpecial Weather StatementJAXUnion46 min
Jun 19, 7:59 PM EDTSpecial Weather StatementJAXBaker46 min
Jun 19, 3:48 PM EDTSpecial Weather StatementJAXGlynn57 min
Jun 19, 3:51 PM EDTSpecial Weather StatementJAXCamden54 min
Jun 19, 7:56 PM EDTSpecial Weather StatementJAXWayne49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020Severe Thunderstorm Warnings in Georgia, 2020Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.